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Mercury Sable 2008
I have a noticed an occasional knock when I accelerate round about where overdrive kicks in.
Doesn't happen if OD disabled.
I was concerned it was the transmission, but I found a video on Youtube suggesting that it's really a engine misfire due to the plugs.
This sounds exactly like what I'm experiencing.
Anyone else had this issue?

Thanks for the help.
The seal at the bottom of the door had stuck over the drain. Stuck my finger under it, water drained out. Waiting to see if problem re-occurs, and if I need to get further to clean it.

I have a 2008 Mercury Sable.
Recently I noticed a sloshing sound coming from the rear passenger door.
It seems as though the window seal is leaking, and water is collecting inside the door. Removing the bottom screw to the interior molding allows some, but not all, of the water to drain.
Does anyone have any advice on how to fix this problem?